Full Auto

XBOX LIVE RANK LEVEL 1 25 points
XBOX LIVE RANK LEVEL 2 50 points
XBOX LIVE RANK LEVEL 3 75 points
XBOX LIVE RANK LEVEL 4 100 points
XBOX LIVE RANK LEVEL 5 200 points
XBOX LIVE RANK LEVEL 6 300 points
XBOX LIVE RANK LEVEL 7 400 points
XBOX LIVE RANK LEVEL 8 600 points
XBOX LIVE RANK LEVEL 9 800 points
XBOX LIVE RANK LEVEL 10 1000 points

If boosting, the quickest way is to start a RANKED circuit match on the map "Containment" with A class cars, specific cars don't really matter, but outlaw is fast and has decent handling.

When you start, if you don't steer at all you will just keep falling into the water. If someone shoots you before you fall in, they get credit for killing you. So one player should simply park and shoot the other as they fall in. Then trade places. Whoever is going to win the race should get at least 50k wreck points (10 kills). Whoever is taking 2nd should get at least 60k wreck points. Then go ahead and finish the race, but make sure that both people get to the finish line (you have about 30 seconds after 1st place finishes). That will get you at least 30 points at the end of the race. (If you get more wreck points, it will display more than 30 on the race report, but only 30 of those are actually added to your score for the purposes of rank & leaderboards).

This is when you SHOULD get each rank:
XBOX LIVE RANK LEVEL 1 25 points
XBOX LIVE RANK LEVEL 2 50 points
XBOX LIVE RANK LEVEL 3 75 points
XBOX LIVE RANK LEVEL 4 100 points
XBOX LIVE RANK LEVEL 5 200 points
XBOX LIVE RANK LEVEL 6 300 points
XBOX LIVE RANK LEVEL 7 400 points
XBOX LIVE RANK LEVEL 8 600 points
XBOX LIVE RANK LEVEL 9 800 points
XBOX LIVE RANK LEVEL 10 1000 points

Some people have reported a glitch where your points stop earning you ranks, although they do show up on the leaderboards.

If you are overdue for a rank (i.e. you played 4 30 point matches and haven't gone from 5 to 6) try exiting to dashboard and reloading the game. I have no idea if there is a connection, but when it happened to me, I also:
*lost the ability to tune my weapons
*when i went back to the main menu to view my stats it was showing as 0 kills etc.
*when i went to settings (RB) and then to game save settings it said something like Save Loc.:Unknown.

After i dashboarded and reloaded the game i was able to gain ranks again. (Just reloading my save w/o dashboarding fixed the other 3 issues, but did not allow me to rank up).

Easiest way to do this is to put the game on the shortest track (Containment) and on the shortest amount of laps (Two if im not mistaken)..

Have yourself and a friend or second console then line your car up so you can shoot the other car once before it goes off the edge into the water giving you easy kills.

Every time the other car re-spawns its current speed will carry it straight into the water while you shoot it on its path.

Once you obtain 55,000 points finish the race for maximum points.